As someone who has done thousands of hours of programming in a visual language (IAR Visual State), I hate it. The promise of an easy visual overview quickly drowns in a sea of edge cases.

A picture says a thousand words, sure, but precicely what those words are turns out to be important. We use text for programming because it allows us to express ourselves unambigously.

I sure would like to see more visual representations of text programs though, this seems like the best of both worlds to me.